Method for preparing barium sulfate nanoparticles
A nanoparticle, barium sulfate technology, applied in nanotechnology, calcium/strontium/barium sulfate and other directions, can solve the problems of small nucleation, uneven nucleation, affecting particle quality, etc., and achieves good repeatability and stability. , The operation process is simple and the cost of raw materials is low.
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[0019] Example 1:
[0020] At 70°C, prepare 1000 mL of barium sulfide suspension with a molar concentration of 2.5 mol / L and 800 g of a sodium sulfate solution with a 45% mass fraction. Under the action of the pressure difference, the sodium sulfate solution passes through the micropores with an equivalent diameter of 200 microns at a flow rate of 0.5m / s and is mixed with a barium sulfide suspension with a cross-flow circulation and a flow rate of 1m / s, and the reaction produces sulfuric acid Barium precipitates, and cyclically react to the chemical ratio. The product undergoes maturation, solid-liquid separation, water washing to remove impurities, drying, and pulverization to obtain the final barium sulfate particles with an average particle size of 48 nm.
Example Embodiment
[0021] Example 2:
[0022] At 50° C., 1000 mL of barium sulfide solution with a molar concentration of 1.5 mol / L and 720 g of a sodium sulfate solution with a mass fraction of 30% were prepared. Under the action of the pressure difference, the sodium sulfate solution passes through the micropores with an equivalent diameter of 200 microns at a flow rate of 5m / s and is mixed with the barium sulfide solution with a cross-flow flow rate of 3m / s, and reacts to form barium sulfate precipitation. The product undergoes maturation, solid-liquid separation, water washing to remove impurities, drying and pulverization to obtain the final barium sulfate particles with an average particle size of 43nm.
Example Embodiment
[0023] Example 3:
[0024] At 20°C, prepare 1000 mL of barium sulfide suspension with a molar concentration of 0.5 mol / L and 720 g of a sodium sulfate solution with a mass fraction of 10%. Under the action of the pressure difference, the sodium sulfate solution passes through the micropores with an equivalent diameter of 600 microns at a flow rate of 0.1m / s and is mixed with a barium sulfide suspension with a cross-flow circulation and a flow rate of 0.3m / s. Barium sulfate precipitates, and the reaction is cyclically reacted to the chemical ratio. The product undergoes maturation, solid-liquid separation, water washing to remove impurities, drying, and crushing to obtain final barium sulfate particles with an average particle size of 40 nm.
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